Updated Varnish Cache packages has been released for both Debian GNU/Linux 8 and 9

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Debian Security Advisory DSA-3924-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
August 02, 2017 https://www.debian.org/security/faq
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Package : varnish
CVE ID : not yet assigned
Debian Bug : 870467

A denial of service vulnerability was discovered in Varnish, a state of
the art, high-performance web accelerator. Specially crafted HTTP
requests can cause the Varnish daemon to assert and restart, clearing
the cache in the process.

See https://varnish-cache.org/security/VSV00001.html for details.

For the oldstable distribution (jessie), this problem has been fixed
in version 4.0.2-1+deb8u1.

For the stable distribution (stretch), this problem has been fixed in
version 5.0.0-7+deb9u1.

We recommend that you upgrade your varnish packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

  Varnish security update for Debian 8 and 9